Unravelling the enhanced reactivity of bulk CeO2 doped with gallium: A periodic DFT study

PAOLA QUAINO; OLGA SYZGANTSEVA ; LUCA SIFFERT; FREDERIK TIELENS; CHRISTIAN MINOT; MONICA CALATAYUD

CHEMICAL PHYSICS LETTERS

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2012 vol. 519 p. 69 - 72

0009-2614

Doping CeO2 with gallium leads to promising materials with application in hydrogen purification processes for fuel cells. The bulk ceria?gallia is investigated by ab initio calculations. The outstanding reactivity is explained by important relaxations induced by gallium in the ceria host, having a strong impact in the electronic structure. As a result, the mixed oxide is found to be more reducible than the pure oxides in agreement with experimental data. It is thus possible to correlate structure and reactivity of the doped system on the molecular level, representing a step forward to the rational design of materials with selected properties.